Lath-board.



S. M. FORD.

LATH BOARD.

APPLICATION FILED Aue.9,19x5.

Patented Nov. 16, 19-15.

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studding or beams of buildings to form a foundation for plaster.

The invention has for its object to provide a lath board of flexible fibrous sheeting which is corrugated to form keyed lath-like projections and alternate depressions in order to receive the plaster in the domes sions and to form hollow air spaces neath the projections, and wherein the side;

edges of the projections are externally fractured so as to afford an irregularly broken and ragged surface for the plaster to cling to, thereby strengthening the plaster surface and making it possible to'increase the spaces between the lath projections.

More particularly the invention consists in the construction, combination, and arrangement of parts hereinafter described and claimed.

In the accompanying drawings showing an embodiment of the invention, Figure l is a perspective View of a fragment of the improved lath-board held to form by an adherent backing sheet; Fig. 2 is a perspective view of a small fragment of the same upon an enlarged scale to show the nature of the fractured edges; and Fig. 3 is a perspective view of a fragment of the board secured to the backing sheet by staples.

The lath-board of the present invention.

is made preferably of rather thick waterproofed paper or board such as rope stock surfaced or impregnated with asphalt or the like, and stiff enough to break or crack exteriorly at the edges when bent and pressed at a sharp angle.

The sheet is pressed or molded to form corrugations having spaced lath-like projections 2 and alternate depressions 3, the projections on one side forming the depressions on the other side, and vice versa.

As will be seen from the drawings, the sheet is pressed so that the projections are of keyed-lath shape with their undersides 4 bent inwardly toward each other at an angle sharp or small enough to cause the side edges 5 of the projections to he externally SILAS FORD, OF ST. PAUL, MINNESOTA."

Specification of Letters Patent.

' inclined sides of the projections.

. waterproofed material, may

1 sheet and made to adhere to sheet and the backing,

fractured when the PatentedjNov. 115,19151. Application filed August 9, 1915. Serial No. 44,510. H 1

board bent pressed, that is for the exterior layers of the sheet to be fractured, so as to form ragged partially split side edges to which the plaster Will adhere with great tenacity. If desired the board can be first scored or lightly cut along-the line of fold to cause it to break more readily. By reason of the greater adherence of the plaster to the fractured edges the projections can be spaced far enough apart to'allow the plaster to fill or nearly fill the depressions 3 beneath the The spaces between the faces of the projections and their inwardly inclined undersides -form longitudinal air spaces which serve as heat insulating and sound deadening spaces.

In order to hold the corrugations to form, a backing sheet or board 6, preferably of be placed upon the corrugated it by asphalt or other suitable binding means, as shown in Fig. 1, or be fastened to it by means of the back or underside of staples or other fastening devices 7 piercing the depressed portions of the corrugated as shown in Fig. 3.

In use the board can be made in a long sheet of convenient width from which suitable lengths or sections can be out ofi and nailed to the studding. 1s in place and plastered over, the plaster will fill the keyed lath shaped depressions 3 between and under the lath projections and'adhere to the fractured edges of the projections while under each lath face will bea heat and sound insulating space. Furthermore the corrugations are flexible and elastic enough to yield when the plaster expands under changes in humidity or temperature so that the plaster is less likely to shrink away from the lath board.

I claim:

1. A lath-board comprising a sheet of flexible fibrous material corrugated to form interspaced keyed lath projections and intermediate depressions, the side edges of the projections being exteriorly fractured along their length to form an irregular holding surface for plaster.

2. A lath-board comprising a sheet of flexible fibrous material corrugated to form interspaced keyed lath projections and inlVhen the board ragged holding surface for plaster, and

means for holding said corrugations to orm.

3. A lath-board comprising a sheet of flexible fibrous material corrugated to form interspaced la th projections and interme- 'diate depressions,

projections being exteriorly fractured along their-length to form an irregular holding surface for plaster.

' PI'lSlIlg a sheet f u 4:. A lath-board flexible fibrous naterial corrugated to form bent inwardly tointerspaced'keyed lath projections and intermediate depressions, the side edges-of the projections 'beingexteriorly' ractured along their length to form an irregular holding surface for plaster, sheet secured upon the underside of said.

corrugations whereby to hold them toforin.

; In testimony whereof I afiix' my signature 1n presenceof two WllZIlBSSGS SILASM. FORD. Witnesses: ARTHUR P. LOTHROP, H. Sw'ANsoN,

and a hacking 

